%0 Generic %1 sanchez2013characteristic %A Sanchez, S. F. %A Rosales-Ortega, F. F. %A Iglesias-Paramo, J. %A Molla, M. %A Barrera-Ballesteros, J. %A Marino, R. A. %A Perez, E. %A Sanchez-Blazquez, P. %A Delgado, R. Gonzalez %A Fernandes, R. Cid %A de Lorenzo-Caceres, A. %A Mendez-Abreu, J. %A Galbany, L. %A Falcon-Barroso, J. %A Miralles-Caballero, D. %A Husemann, B. %A Garcia-Benito, R. %A Mast, D. %A Walcher, C. J. %A de Paz, A. Gil %A Garcia-Lorenzo, B. %A Jungwiert, B. %A Vilchez, J. M. %A Jilkova, Lucie %A Lyubenova, M. %A Cortijo-Ferrero, C. %A Diaz, A. I. %A Wisotzki, L. %A Marquez, I. %A Bland-Hawthorn, J. %A Ellis, S. %A van de Ven, G. %A Jahnke, K. %A Papaderos, P. %A Gomes, J. M. %A Mendoza, M. A. %A Lopez-Sanchez, Á. R. %A collaboration, The CALIFA %D 2013 %K abundance galaxy gradient oxygen %T A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA %U http://arxiv.org/abs/1311.7052 %X We present the largest and most homogeneous catalog of HII regions and associations compiled so far. The catalog comprises more than 7000 ionized regions, extracted from 306 galaxies observed by the CALIFA survey. We describe the procedures used to detect, select, and analyse the spectroscopic properties of these ionized regions. In the current study we focus on the characterization of the radial gradient of the oxygen abundance in the ionized gas, based on the study of the deprojected distribution of HII regions. We found that all galaxies without clear evidence of an interaction present a common gradient in the oxygen abundance, with a characteristic slope of alpha = -0.1 dex/re between 0.3 and 2 disk effective radii, and a scatter compatible with random fluctuations around this value, when the gradient is normalized to the disk effective radius. The slope is independent of morphology, incidence of bars, absolute magnitude or mass. Only those galaxies with evidence of interactions and/or clear merging systems present a significant shallower gradient, consistent with previous results. The majority of the 94 galaxies with H ii regions detected beyond 2 disk effective radii present a flattening in the oxygen abundance. The flattening is statistically significant. We cannot provide with a conclusive answer regarding the origin of this flattening. However, our results indicate that its origin is most probably related to the secular evolution of galaxies. Finally, we find a drop/truncation of the oxygen abundance in the inner regions for 26 of the galaxies. All of them are non-interacting, mostly unbarred, Sb/Sbc galaxies. This feature is associated with a central star-forming ring, which suggests that both features are produced by radial gas flows induced by resonance processes.

@misc{sanchez2013characteristic, abstract = {We present the largest and most homogeneous catalog of HII regions and associations compiled so far. The catalog comprises more than 7000 ionized regions, extracted from 306 galaxies observed by the CALIFA survey. We describe the procedures used to detect, select, and analyse the spectroscopic properties of these ionized regions. In the current study we focus on the characterization of the radial gradient of the oxygen abundance in the ionized gas, based on the study of the deprojected distribution of HII regions. We found that all galaxies without clear evidence of an interaction present a common gradient in the oxygen abundance, with a characteristic slope of alpha = -0.1 dex/re between 0.3 and 2 disk effective radii, and a scatter compatible with random fluctuations around this value, when the gradient is normalized to the disk effective radius. The slope is independent of morphology, incidence of bars, absolute magnitude or mass. Only those galaxies with evidence of interactions and/or clear merging systems present a significant shallower gradient, consistent with previous results. The majority of the 94 galaxies with H ii regions detected beyond 2 disk effective radii present a flattening in the oxygen abundance. The flattening is statistically significant. We cannot provide with a conclusive answer regarding the origin of this flattening. However, our results indicate that its origin is most probably related to the secular evolution of galaxies. Finally, we find a drop/truncation of the oxygen abundance in the inner regions for 26 of the galaxies. All of them are non-interacting, mostly unbarred, Sb/Sbc galaxies. This feature is associated with a central star-forming ring, which suggests that both features are produced by radial gas flows induced by resonance processes.}, added-at = {2013-11-28T08:27:47.000+0100}, author = {Sanchez, S. F. and Rosales-Ortega, F. F. and Iglesias-Paramo, J. and Molla, M. and Barrera-Ballesteros, J. and Marino, R. A. and Perez, E. and Sanchez-Blazquez, P. and Delgado, R. Gonzalez and Fernandes, R. Cid and de Lorenzo-Caceres, A. and Mendez-Abreu, J. and Galbany, L. and Falcon-Barroso, J. and Miralles-Caballero, D. and Husemann, B. and Garcia-Benito, R. and Mast, D. and Walcher, C. J. and de Paz, A. Gil and Garcia-Lorenzo, B. and Jungwiert, B. and Vilchez, J. M. and Jilkova, Lucie and Lyubenova, M. and Cortijo-Ferrero, C. and Diaz, A. I. and Wisotzki, L. and Marquez, I. and Bland-Hawthorn, J. and Ellis, S. and van de Ven, G. and Jahnke, K. and Papaderos, P. and Gomes, J. M. and Mendoza, M. A. and Lopez-Sanchez, Á. R. and collaboration, The CALIFA}, biburl = {https://www.bibsonomy.org/bibtex/293f0e9b8994d6ac5e12c93bd5e588ac6/miki}, description = {[1311.7052] A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA}, interhash = {1ed0ece76ae602d512d168eb707a2210}, intrahash = {93f0e9b8994d6ac5e12c93bd5e588ac6}, keywords = {abundance galaxy gradient oxygen}, note = {cite arxiv:1311.7052Comment: 25 Pages, 15 Figures, Accepted for publishing in A&A}, timestamp = {2013-11-28T08:27:47.000+0100}, title = {A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA}, url = {http://arxiv.org/abs/1311.7052}, year = 2013 }